Sekisui Medical Co., Ltd.

Kikkoman Corporation

Daiichi Pure Chemicals Co., Ltd.

Seishin Pharmaceutical Co., Ltd.

Kazuo Kotani

Motoki Morita

Keigo Kohno

Masato Nishikawa

Osamu Miyazaki

Kazunori Saito

Shoichi Tokutake

Hirokazu Yago

Masanao Matsuo

Yuka Akimoto

Tadashi Tomikura

Kohichiro Tobe

Immunochromatographic test device

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The present invention provides a maltooligoside derivative represented by the formula: ##STR1## wherein n denotes an integer 3-5, R represents an aromatic chromophoric group, X represents a group &gt;CHCH.sub.2 N.sub.3 or &gt;C.dbd.CH.sub.2, and Y represents a hydrogen atom, a substituted or unsubstituted hydrocarbon group or an alkyl- or arylsulfonyl group, a reagent for determining .alpha.-amylase activity which comprises said maltooligoside derivative as an effective ingredient, and a process for determining .alpha.-amylase activity, characterized in that said maltooligoside derivative and coupled enzymes are added to an .alpha.-amylase containing sample to conduct an enzymatic reaction and a liberated aromatic chromophoric compound is quantitatively determined. The compound of the present invention is very useful as a substrate for determining .alpha.-amylase activity, and .alpha.-amylase activity can be easily measured accurately in a short time by using the reagent without affection of the other ingredients contained in the sample.

Maltooligoside derivative, reagent for determining .alpha.-amylase

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Tokyo, Japan

Kazuo Kotani